Lightspeed Venture Partners X, L.P.

CIK 1602573 · last filed 2024-05-01

Lightspeed Venture Partners X, L.P. is a corporate insider who has filed 4 SEC Form 4 insider transactions across 3 companies since 2018. The most recent filing, for RBRK, was dated Dec 12, 2025. Across all open-market trades the lifetime net is +$50.0M, making them a net buyer over the disclosed history. Current disclosed insider exposure totals $196.4M across reported positions.

"Disclosed insider exposure" sums this person's most-recently-reported share counts across each company they're an insider in, multiplied by the current underlying price. It is not net worth — it misses retail holdings, private investments, real estate, index funds, and any company where the person isn't an SEC-reporting insider. For informational purposes only.

Disclosed Exposure

$196.40M

Companies

3

Total Filings

4

Lifetime Open-Market Net

$50.00M

Holdings By Company

Latest on-record share count from this person's most recent non-derivative Form 4 transaction in each company. Disclosed exposure = shares × current underlying price.

Symbol	Role	Shares	Price	Disclosed Exposure	Lifetime OM Net	Filings	Latest Filed
RBRK	10%+ Owner	—	$83.64	—	$0	1	2024-05-01
Forty Seven, Inc. (FTSV) Delisted	10%+ Owner	66,743	—	—	$50.00M	1	2019-07-24
GH	10%+ Owner	1,169,163	$167.98	$196.40M	$0	1	2018-10-11

Recent Filings

4 filings

Insider activity across all companies, newest first. Form 4 rows are post-trade confirmations (buys, sells, grants, exercises). Notice (144) rows are pre-trade notices of intent to sell restricted or control stock under Rule 144 — they may not all execute. Compare adjacent dates to see which notices became actual sales.

Filed	Symbol	Action	Net Shares	Net $	Link
2025-12-12	RBRK	Notice (144)	−101,659	-$8.85M	EDGAR
2024-05-01	RBRK	Conv (C)	—	$0	EDGAR
2019-07-24	Forty Seven, Inc. (FTSV) Delisted	Buy (P)	+6,250,000	$50.00M	EDGAR
2018-10-11	GH	Conv (C)	+11,048,589	$0	EDGAR

Form 4 codes: P = open-market purchase · S = open-market sale · A = grant/award · M = option exercise · F = tax withholding at vest · G = bona-fide gift · D = disposition to issuer · J = other (see filing footnote). Only P / S codes carry directional signal.
Notice (144 / 144/A): Form 144 is a notice of intent to sell restricted/control stock under Rule 144, filed before the sale; 144/A is an amendment. Many notices are pre-scheduled under Rule 10b5-1 plans. A Form 4 with code S typically follows within a few days when the planned sale executes; missing follow-up Form 4s suggest the notice was cancelled or modified.